Home / 20,840.92-28,760.22-11,409.40

Finding the Fourth Proportional to 20,840.92, 28,760.22 and 11,409.40

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Solution

The fourth proportional to 20,840.92, 28,760.22 and 11,409.40 is: 15,744.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.92 : 28,760.22 = 11,409.40 : x
  2. Step 2: Convert to fraction form
    20,840.92/28,760.22 = 11,409.40/x
  3. Step 3: Cross multiply
    20,840.92x = 28,760.22 × 11,409.40
  4. Step 4: Simplify right side
    20,840.92x = 328,136,854.07
  5. Step 5: Solve for x
    x = 328,136,854.07/20,840.92
  6. Step 6: Final answer
    x = 15,744.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.